Search for ${\Lambda }_c^{+}\to p{K}^{+}{\pi }^{-}$ and $D_s^{+}\to K^{+}{K}^{+}{\pi }^{-}$ Using Genetic Programming Event Selection

Abstract

We apply a genetic programming technique to search for the double Cabibbo suppressed decays ${\Lambda }_c^{+}\to p{K}^{+}{\pi }^{-}$ and $D_s^{+}\to K^{+}{K}^{+}{\pi }^{-}$. We normalize these decays to their Cabibbo favored partners and find $\text{BR}($Λ_c^+ \to p K^+ π^-$)/\text{BR}($Λ_c^+ \to p K^- π^+$)=(0.05\pm 0.26\pm 0.02)$ and $\text{BR}($D_s^+ \to K^+ K^+ π^-$)/\text{BR}($D_s^+ \to K^+ K^- π^+$)=(0.52\pm 0.17\pm 0.11)$ where the first errors are statistical and the second are systematic. Expressed as 90% confidence levels (CL), we find $<0.46$ and $<0.78$ respectively. This is the first successful use of genetic programming in a high energy physics data analysis.

10 pages